Slate-frame



(No Model.) A W.

SLATE FRAME.

Illlll'l'l.

izvezaiar UNTTED STATES PATENT OFFICE.

ALBERT W. STOSSMEISTER, OF NEWPORT, KENTUCKY.

SL ATE-FRAlVlE.

SPECIFICATION forming part of Letters Patent No. 253,234, dated February '7, 1882.

Application filed August 22 1881. (X0 model.)

To all whom it may concern Be it known that I, ALBERT W. Srossnms- TER, a citizen of the United States, residing at Newport, Campbell county, Kentucky, have invented new and useful [mprovementsin Slate Frames,ofwhieh thefollowingisaspecification.

My invention relates to schoolslates, its object being to provide an economical and durable frame as a substitute for the wooden frames commonly in use, and free from the objections incident thereto.

To this end myinvention consists in forming a slate-frame of continuous strips or pieces of pasteboard, straw-board, hard felting, or similar material, out by suitable dies from the inerchant sheets or slabs, the frame, when completed, beingformed byimposing one such strip upon another, with the slate between, and cementing or gluing the pieces together under pressure in shaping dies and molds, with or without a third interposed strip,as hereinafter described.

It consists, also, in the construction of and mode ofhinging a double slate; and,lastly,in a slate-frame out from sheets of material such as described and readyto receive the slate, as a new article of manufacture.

My invention is illustrated in the accompanying drawings, in which Figure 1 is a diagram representing a sheet of merchant pasteboard or similar material cut into slate-frames, with the pieces still in sitar. Fig. 2 is a cross-section of a slate complete framed according to my invention, with two strips and a third interposed strip. Fig. 3 is a partial cross-section, showing the relation of the outer strip to the slate before the interposed strip is placed-in position. Fig. 4 is a partial cross-section, showing a framein which no interposed strip is used, but the outer strips are forced together by pressure around the slate. Fig. 5 is a partial cross-section, showing the position of the bin gewire when such is used for double slates. Fig. 6 is a partial plan View, also showing the position of the hinge-wire and hinge-cleats; and Fig. 7 is an end view of a double slate, showing the hinge.

Referring to the lettered parts of the drawings, A designates a sheet or board of heavy pasteboard, straw-board, tar-board, hard felting,or any similar fibrous material, and the lines a to indicate the cuts separating the sheet into continuous rectangular strips. The sheet being manufactured to proper size, it is obvious that it is wholly utilized, excepting such portions of its outer edge as lie beyond the outer cut and the interior piece, b.

In forming slate-frames I take two annular strips, 0 c, of a corresponding size, and place the slate it between them, as shown in Fig. 3, the strips being held apart adistance equal to the thickness of the slate by the latter. A narrower annular strip, of similar material, or thin strips of wood, (1, (shown in section in Figs. 2 and 5,) are then laid between the strips 0 c in the interval, with their wide surfaces thoroughly spread with glue or cement, and the slate then subjected to pressure between two flat surfaces until the cement dries and retains the parts of the frame together. Where a more porous quality of the material is used, however, the intervening strip, (1, may be dispensed with and the material compacted and forced together into the position shown in Fig. 4 by suitably-formed dies, their adjacent surfaces being first glued and the slate placed in position between them. After the frame and slate are suitablyjoined the edges of theformer are properly trimmed and finished, and .the frame then painted or varnished with a waterproof pigment and allowed to dry to a hard and durable surface; and if the materiaLof the frame is of a porous nature and easily separable it should be thoroughly soaked in a siz ing of glue before being applied to the slate, and compressed thereon while yet soft and moist.

In making the double slate space is left between the interposed strip and the edge of the slate at one side for a stout wire, 6, extending through and beyond the frame, as shown in Figs. 5 and 6, and a small corner recess, f, is cut out of the frame to allow the hinge-yokeg to lie against the end of the frame within its general outline limit. The ends of the wire 0 are inserted through the hinge-yoke g and upset to form a riveted connection, as shown in Figs. 6 and 7. Thus it will be seen that the slate may lie in any position on a table or desk without allowing the edges of the hinge to come in contact therewith, while the continuous pintle and mode of securing it form an exceedingly strongand durable connection,which in case of accidental injury can be restored by removing the old and inserting a new pintle.

The advantages of my invention are in the economy and durability of the frame, which does not crack or split, and which, by reason of the non-absorbent nature of the frame when painted, clamps and retains the slate with absolute security.

It is obvious that the frames can be prepared and sold separately and applied by any individual to a slate with a very moderate exercise of skill and intelligence, and with the means at command in every household; also, that the frame may be made in any form and applied to other uses.

Having described my invention,I claim and desire to secure by Letters Patent- 1. A. slate-frame consisting of continuous a11- nnlar strips of pasteboard or other similar material, cut from the merchant sheets and overlapping the edges of the slate, and interposed narrower strips surrounding the slate, all held together bycementing adjacent surfaces, substantially as specified.

2. In combination with the slate-frames as constructed, the continuous pintles e 0, held between the overlapping strips, the slate-edge, and the interposed strip, and the yokes gg, in which the ends of the pintles are riveted, substantially as and for the purpose set forth.

3. As a new article of manufacture, a schoolslate having a frame made of two continuous annular strips of pasteboard, tar-board, hard felting, or similar material,commonly produced in merchant sheets, cut from such sheets, and interposed narrower strips of the same or other material surrounding the slate at the edges, substantially as set forth.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

ALBERT \V. S'IOSSMEISTER.

\Yitnesses U. P. DOOLITILE,

A. NAILOR. 

